Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
, as water in communicating vessels (94) also seeks a level, it iseasy to construct an apparatus for finding horizontal lines and direc-tions with a small and portable quantity of water, as shown in the 80 HYDROSTATICS. instrument known as the w«/er-/ete^; which consists of two uprighttubes,… … wires, to the ends of which are attached sights, LL, Avhich consist oftwo fine hairs or threads, stretched at right angles across a squareframe. The instrument is mounted on a stanchion, provided with aball and socket joint. Suppose the instrument to be placed in a hori-zontal position (as in the…
Physics · Astronomy
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